> > My own theory is that the server gets sufficiently busy with disk I/O
> > (or in your case NFS I/O) that it doesn't have time to process the
> > keepalive messages. See for instance
> >
> > https://lists.isc.org/pipermail/dhcp-users/2008-August/007017.html>> I'd believe that if our server was really very busy. But we're only
> receiving maybe 5-10 messages a second at most... CPU sits at about 1%
> usage.
The CPU usage is normally not relevant at all. Have you looked at your
disk I/O statistics? I/Os per second, percentage busy, etc. On FreeBSD
6 (and newer) gstat is a good tool for this.
Steinar Haug, Nethelp consulting, sthaug at nethelp.no